mellow wrote:
This is not true, I have run into many guys running 19.5 aired down on the beach with big rigs, and this is in sugar sand not hard sand, so it CAN be done, I couldn't believe it till I saw it.
Of course, you can drive anything on a beach. Fwiw, I’ve driven even a Class A on the beach and my TC as well that has 19.5s. My main point is that if you main goal is traction on soft sand, 19.5s aren’t the best choice. Sounds like OP is getting ready to drop a lot of money on a setup, so I wanted him to be aware. Obviously, he can do what he wants.
I don’t know what you saw. The minimum tire pressure for 19.5s is a lot higher due to the type of bead with most people recommending going no less than 60. Technically going from 110 to 60 is airing down, but not anywhere near what standard E DRW tires can do at 20 or even lower.. Furthermore the carcass is a lot thicker and stronger as a commercial tire which means you have very little benefit of low pressure.